CN104609813B - A kind of Gypsum Fibrosum powder preparing ceramic die and preparation method thereof - Google Patents
A kind of Gypsum Fibrosum powder preparing ceramic die and preparation method thereof Download PDFInfo
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- CN104609813B CN104609813B CN201410786990.6A CN201410786990A CN104609813B CN 104609813 B CN104609813 B CN 104609813B CN 201410786990 A CN201410786990 A CN 201410786990A CN 104609813 B CN104609813 B CN 104609813B
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Abstract
A kind of Gypsum Fibrosum powder preparing ceramic die, including major ingredient and adjuvant；The component of major ingredient includes that desulfurated plaster and citric acid gypsum, described desulfurated plaster and citric acid gypsum mass percent are 3 1～5 1；Described adjuvant includes retarder, calcium sulfate crystal whiskers and quick lime, and wherein retarder accounts for the mass fraction of major ingredient is 0.1～0.5 ‰, and it is 0～2% that calcium sulfate crystal whiskers accounts for the mass fraction of major ingredient, and it is 0～2% that quick lime accounts for the mass fraction of major ingredient.The preparation method of a kind of Gypsum Fibrosum powder for preparing ceramic die, step is as follows: desulfurated plaster and citric acid gypsum are put into fluidized bed calcination system and calcined by (1)；(2) the major ingredient milling equipment after calcining is carried out grinding；(3) major ingredient after grinding adds adjuvant to be modified.Described Gypsum Fibrosum powder water absorption rate is high, setting expansion rate is suppressed, intensity is high.
Description
Technical field
The present invention relates to Gypsum Fibrosum powder and preparation method thereof, particularly to a kind of for Gypsum Fibrosum powder preparing ceramic die and preparation method thereof.
Background technology
Injection forming is the ceramic molding of a kind of simple, there are due to plastering a series of above advantages such as lightweight, production efficiency is high, fire resistance good, easy cast, aboundresources, less energy consumption, therefore use as model plaster in moulding handicraft, making dentistry, pottery, machine casting.Model plaster divides general models Gypsum Fibrosum and high strength gypsum two kinds.China accounts for about the 15% of China's Production of Ceramics industry for the model plaster manufacturing pottery, and ceramic industry is the conventional industries of China, pays close attention to widely so causing, and obtains substantial amounts of achievement.But in recent years, anxiety along with China's daily water-consumption forecasting, make being becoming tight Gypsum Fibrosum day of domestic ceramics mould raw material, Gypsum Mine resource quality has declined, Gypsum Fibrosum price rises steadily, and China's domestic ceramics is increasing to the demand of Gypsum Fibrosum, and this imbalance between supply and demand causes being generally reduced of domestic ceramics die quality, add the cost of porcelain product, have impact on the benefit of enterprise.And the industry by-product gypsum being often close on 1.5 hundred million t has increasingly becomed important gypsum resource, and cause the great attention of country.Industry by-product gypsum is stored up in a large number; both land occupation; waste again resource; surrounding enviroment are easily polluted by the acidity contained and other harmful substances; have become as restriction China's coal-firing units gas desulfurization and the key factor of phosphatic fertilizer company sustainable development, hence with industry by-product gypsum to national environmental protection and strategy of sustainable development important.
At present, China is for the mould gypsum powder of pottery molding, it is by the semi-hydrated gypsum powder of natural gypsum ore processing mostly, Gypsum Fibrosum is through aquation, hardening forms dihydrate gypsum, become the gypsum mold with water absorption and some strength after drying, and though the beta-type semi-hydrated gypsum processed with desulfurated plaster has certain water absorption for production mould Gypsum Fibrosum, but without the high water absorbing capacity reached required by ceramic die, low coagulation expansion rate requirement, China is not mature enough and perfect to the research improving desulphurization building gypsum goods water absorption rate at present, many Production of Ceramics enterprises take α, the method of beta-type semi-hydrated gypsum mixing improves its performance, but matching problem and the difference of hydrating capacity due to both Gypsum Fibrosum powders, still it is difficult to produce intensity, water absorption rate and setting expansion rate all preferably ceramic die Gypsum Fibrosum powder.
Summary of the invention
In place of above-mentioned the deficiencies in the prior art, the problem that the present invention solves is: the intensity of the ceramic die prepared with former α, beta-type semi-hydrated gypsum is low, water absorption is poor, setting expansion rate variance.
For solving above-mentioned problem of the prior art, the present invention adopts the following technical scheme that:
A kind of Gypsum Fibrosum powder for preparing ceramic die, including major ingredient and adjuvant；The component of major ingredient includes that desulfurated plaster and citric acid gypsum, described desulfurated plaster and citric acid gypsum mass percent are 3 1～5 1；Described adjuvant includes retarder, calcium sulfate crystal whiskers and quick lime, and wherein retarder accounts for the mass fraction of major ingredient is 0.1～0.5 ‰, and it is 0～2% that calcium sulfate crystal whiskers accounts for the mass fraction of major ingredient, and it is 0～2% that quick lime accounts for the mass fraction of major ingredient.
Further, described retarder is one or more in sodium citrate, citric acid, osseocolla, sodium polyphosphate.
The preparation method of a kind of Gypsum Fibrosum powder for preparing ceramic die, step is as follows: desulfurated plaster and citric acid gypsum are put into fluidized bed calcination system and calcined by (1)；(2) the major ingredient milling equipment after calcining is carried out grinding；(3) major ingredient after grinding adds adjuvant to be modified.
Further, the calcining heat of described major ingredient is 150～160 DEG C.
Further, described grinding time is 10～30 minutes.
Further, described calcining heat is adjusted by amount of gypsum control methods and heat conduction oil mass control methods.
Further, described mixing time is 25～35 minutes.
Further, described mixing speed is 58～62 revs/min.
The invention have the benefit that
Desulfurated plaster and citric acid gypsum both industry by-product gypsums by weight percentage 3 1～5 1 are calcined in fluidized bed calcination system.Citric acid gypsum crystal morphology structure in the form of sheets, unit weight is smaller, use with after desulfurated plaster mixed calcining, on the one hand the unit weight making the major ingredient after calcining reduces, on the other hand the pore size distribution$ of major ingredient after calcining is improved, the most both having improve the water absorption rate of goods, also the development to setting expansion rate serves inhibitory action.And calcining heat has extremely important impact to the quality of finished product, during desulfurated plaster and citric acid gypsum mixed calcining, control calcining heat by amount of gypsum control methods and heat conduction oil mass control methods.Calcining heat can be quickly regulated by regulation calcinatory inlet amount according to the object point that fluidization of solid heat transfer coefficient is big, but the degree of accuracy of regulation temperature is inadequate, but calcining heat can be controlled between 150～160 DEG C by as above two kinds of regulating measures, thus avoid Gypsum Fibrosum generation underburnt or the possibility of burning effectively, therefore the Gypsum Fibrosum powder excellent performance calcined out, intensity is high.The present invention is not only the comprehensive utilization of industry by-product gypsum and opens up a new way, but also solves the problem that current domestic domestic ceramics die quality is poor.
Accompanying drawing explanation
Fig. 1 is desulfurated plaster crystal microphotograph.
Fig. 2 is citric acid gypsum crystal microphotograph.
Detailed description of the invention
Below present invention is described in further detail.
A kind of Gypsum Fibrosum powder for preparing ceramic die, including major ingredient and adjuvant.The component of major ingredient includes that desulfurated plaster and citric acid gypsum, described desulfurated plaster and citric acid gypsum mass percent are 3 1～5 1.Adjuvant includes retarder, calcium sulfate crystal whiskers and quick lime, and wherein retarder accounts for the mass fraction of major ingredient is 0.1～0.5 ‰, and it is 0～2% that calcium sulfate crystal whiskers accounts for the mass fraction of major ingredient, and it is 0～2% that quick lime accounts for the mass fraction of major ingredient.Can be further preferred, retarder is one or more in sodium citrate, citric acid, osseocolla, sodium polyphosphate.Citric acid gypsum crystal morphology structure in the form of sheets, unit weight is smaller, uses after desulfurated plaster mixed calcining, on the one hand the unit weight of goods is made to reduce, on the other hand improving the pore size distribution$ of goods, the most both improve the water absorption rate of goods, also the development to setting expansion rate serves inhibitory action.
The preparation method of a kind of Gypsum Fibrosum powder for preparing ceramic die, step is as follows: desulfurated plaster and citric acid gypsum are put into fluidized bed calcination system and calcined by (1)；(2) the major ingredient milling equipment after calcining is carried out grinding；(3) major ingredient after grinding adds adjuvant to be modified.The calcining heat of major ingredient controls between 150～160 DEG C.Grinding time controlled between 10～30 minutes.Calcining heat is adjusted by amount of gypsum control methods and heat conduction oil mass control methods.Mixing time controlled between 25～35 minutes.Mixing speed controls between 58～62 revs/min.Wherein, Gypsum Fibrosum control methods is through material frequency conversion conveying worm control desulfurated plaster and the conveying capacity of citric acid gypsum.Heat conduction oil mass control methods is through conduction oil electric control valve and controls to enter the heat conduction oil mass of calcinatory.Calcining heat has extremely important impact to the quality of described Gypsum Fibrosum powder, the heat conduction oil mass being increased the amount of gypsum and minimizing entrance calcinatory that enter calcinatory time in desulfurated plaster and citric acid gypsum calcination process when temperature drift by material frequency conversion conveying worm and conduction oil electric control valve respectively controls temperature, calcining heat can be quickly regulated by regulation calcinatory inlet amount according to the object point that fluidization of solid heat transfer coefficient is big, but the degree of accuracy of regulation temperature is inadequate, can the calcining heat of major ingredient be controlled between 150～160 DEG C by as above two kinds of regulating measures, thus avoid Gypsum Fibrosum generation underburnt or the possibility of burning effectively, therefore the Gypsum Fibrosum powder excellent performance calcined out.
Embodiment one:
Desulfurated plaster and citric acid gypsum 3.5:1 by weight percentage are calcined in fluidized bed calcination system, then with milling equipment grinding 10min.By weight, take 98.96 parts of major ingredient powder after grinding, sodium citrate 0.04, quick lime 1 part, put into blender, mixing time 25 minutes, speed of agitator 58 revs/min, obtain ceramic die Gypsum Fibrosum powder 100 parts.
Embodiment two:
Desulfurated plaster and citric acid gypsum 4:1 by weight percentage are calcined in fluidized bed calcination system, then with milling equipment grinding 25min.By weight, take the Gypsum Fibrosum powder after grinding 98.98 parts, citric acid 0.02, calcium sulfate crystal whiskers 1 part, put into blender, mixing time 30 minutes, speed of agitator 60 revs/min, obtain ceramic die Gypsum Fibrosum powder 100 parts.
Embodiment three:
Desulfurated plaster and citric acid gypsum 4.5:1 by weight percentage are calcined in fluidized bed calcination system, then with milling equipment grinding 15min.By weight, take the Gypsum Fibrosum powder after grinding 98.95 parts, citric acid 0.05, quick lime 1 part, put into blender, mixing time 35 minutes, speed of agitator 62 revs/min, obtain ceramic die Gypsum Fibrosum powder 100 parts.
Embodiment four:
Desulfurated plaster and citric acid gypsum 5:1 by weight percentage are calcined in fluidized bed calcination system, then with milling equipment grinding 20min.By weight, take the Gypsum Fibrosum powder after grinding 98.95 parts, sodium citrate 0.05, calcium sulfate crystal whiskers 1 part, put into blender, mixing time 30 minutes, speed of agitator 60 revs/min, obtain ceramic die Gypsum Fibrosum powder 100 parts.
The ceramic die Gypsum Fibrosum powder that said components prepares, the Gypsum Fibrosum detection method that " gypsum building material " that reference standard QB/T1640-92 " ceramic die Gypsum Fibrosum quantitative measurement method " and Chen Yan etc. edits is mentioned carries out performance test, and test result is shown in Table 1.
Table 1
| Presetting period/min | Final setting time/min | 2h rupture strength/MPa | Water absorption rate/% | 2h setting expansion rate/% | |
| Embodiment 1 | 12 | 18 | 3.7 | 40.1 | 0.11 |
| Embodiment 2 | 11 | 19 | 3.9 | 42.5 | 0.1 |
| Embodiment 3 | 11 | 17 | 3.9 | 41.7 | 0.12 |
| Embodiment 4 | 10 | 16 | 4.1 | 43.3 | 0.11 |
As can be drawn from Table 1: the water absorption rate of described Gypsum Fibrosum powder has been up to 43.3%, minimum also reach 40.1%, the standard that water absorption rate is the highest.The setting expansion rate of 2h suppresses below 0.12%.The rupture strength of 2h has also reached more than 3.7MPa, and intensity is high.
Claims (2)
1. the Gypsum Fibrosum powder preparing ceramic die, it is characterised in that include major ingredient and adjuvant；The component of major ingredient includes that desulfurated plaster and citric acid gypsum, described desulfurated plaster and citric acid gypsum mass percent are 3 1～5 1；Described adjuvant includes retarder, calcium sulfate crystal whiskers and quick lime, and wherein retarder accounts for the mass fraction of major ingredient is 0.1～0.5 ‰, and it is 0～2% that calcium sulfate crystal whiskers accounts for the mass fraction of major ingredient, and it is 0～2% that quick lime accounts for the mass fraction of major ingredient.
The Gypsum Fibrosum powder preparing ceramic die the most according to claim 1, it is characterised in that described retarder is one or more in sodium citrate, citric acid, osseocolla, sodium polyphosphate.
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| CN105254264A (en) * | 2015-09-25 | 2016-01-20 | 钦州学院 | Processing method used for increasing Nixing pottery plaster mold strength |
| CN108191367A (en) * | 2017-12-30 | 2018-06-22 | 应城市嘉鸿技术服务科技有限公司 | A kind of gypsum mold molding gypsum powder |
| CN108975855A (en) * | 2018-09-11 | 2018-12-11 | 界首永恩机电科技有限公司 | A kind of model plaster with good wet strength |
| CN111187050B (en) * | 2018-11-14 | 2021-04-27 | 北新集团建材股份有限公司 | Gypsum board and preparation method thereof |
| CN111747718B (en) * | 2020-07-07 | 2022-03-15 | 酒泉钢铁(集团)有限责任公司 | Modified calcium sulfate hemihydrate whisker reinforced gypsum-based composite material and preparation method thereof |
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| CN101028967A (en) * | 2007-01-26 | 2007-09-05 | 宜兴美地建材有限公司 | Method for producing beta-style half-hydrate gypsum from citric-acid industrial fag end |
| CN101993231A (en) * | 2009-08-19 | 2011-03-30 | 江苏仁和建材科技有限公司 | Method for preparing gypsum powder for ceramic mould by using desulfurized gypsum |
| CN102775081B (en) * | 2012-08-24 | 2014-07-23 | 江苏省一夫新材料科技有限公司 | Gypsum calcination system |
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Address after: No. 56, Hongli Road, Jiangning Binjiang Development Zone, Jiangning District, Nanjing City, Jiangsu Province 211161 Patentee after: Yifu Technology Co.,Ltd. Address before: No. 56, Hongli Road, Jiangning Binjiang Development Zone, Jiangning District, Nanjing City, Jiangsu Province 211161 Patentee before: JIANGSU EFFUL SCIENCE AND TECHNOLOGY Co.,Ltd. |